Expansible mandrel



C. G. NAYLOR'.

EXPANSIBLE MANDREL.

Mar. 27,1923

2 SHEETS-SHEET l.

FILED JAN.14. |921.

Mar. 27, 1923.

C. G. NAYLOR.

EXPANSIBLE MANDREL. v

2 safaris- SHEET 2L FILED IAN-14,1921.

Y, [l ill I abutment an Patented Mar. 27, 1923.

CARL e. NAYLOR, or CHICAGO, rLLInors,

PANY, A CORPORATION or DELAWARE;

titans ortica.

ASSIGNOR TO NAYOR-ROBERTSON COM- nxrnn'srnnn MANDREL-- Application led January 14, 1921. `Serial No. 437,231.

To all 'io/wm z't may concern.' i y Be it known that l, CARL G. NAYLOR, a` f citizen of the United States, residing at Chicago, inthe county of @ook and Stateof Illinois, have invented certain new and useful Improvements in Expansible Mandrels, of which the` following` is a` specification.

The invention relates to improvements in expansible mandrels. e n Y One of the objects of the invention is to provide a new and improved expansible mandrel. y y

Another object is to provide a` sectional mandrel, one or moreof which sections may be expanded to varying predetermined eX- tent. Another object is `tolprovide a mandrel especially adapted for use in a machine for v making spi-ral pipe `of strips of sheet metal such as fully describedin my Patent No. i 1,288,134, .granted to me December 17, 1918.. Other, further andmore specific objects of the invention will `become readily ap-y parent, to persons skilled in the art, from a" consideration of the following description, when taken in conjunction with the drawings, wherein p' i Fig. 1 `shows a diametric axial section of oneend of the mandrel having a plurality ofremovable nonexpansible or rigid seotions.

Fig2 is a similar view showing a continuation of the mandrel and one expansible vsection with means for expanding it.

Fig. 3 isan end elevation of a terminal iiange secured to the shaft to provide an d looking from the left towards Figi. i

Fig. et is a transverse section taken on line 4`4 of Fig.`2. i

Fig. 5 is a section of the split ring for insertionin a groove in the `mandrel shaft and an unbroken ring to holdvit in place to limit `the axial movement of the members onthe shaft. i f

Fig. 6 is an enlarged transverse section taken on line 6-6 of Fig. 2.

Fig. 7- is `an'enlarged transverse section taken on line 7-7 of Fig. 2. f

Fig. 8 is anelevation of a fragmental end of the expansiblel section and means for eX- panding it, showing in sections the position of the parts when the mandrel is expanded.

f'cured to the shaft 15, inany s ofbushingsli. The sections 16 to 16f, inclusive, are yinert or no-n-expansible and each section at itsend is supported' on` a bowing thepoe mandrel is diaf Fig. 9 isv a similar view s sition of the parts when th metrically contracted. y

Fig.` 10 is an enlarged axial section of party of one end of the eXpansible mandrel. `F ig. 11k is an enlarged sectional view of part of one endof the axially movable sleeve or toggle head usedfor expanding thel expansible section of the mandrel.

in all the views the .same reference icharacters are employed to indicate similar parts. A shaft 15 may be rotated -by any suitable means and, on this sha-ft, the mandrel sections are to be mounted. For convenience the mandrel is preferably divided into a series of sections 16 of which there may be any desired number accordingto the length of mandrel required. 1

l An abutment ange 17, which may bea member of a shaft coupling', is properly seuitable manner. the fla-nge 18 of whichis perforated, as' att19, to receive a pluralitynof pins 20 that project from the thrust washer 21.4 Around each of the pins is coiled an open helicalkspringr 122 to permit'someqaxial movement `of the composite mandrel on, thei shaft 15 at the timewhen the mandrel is being expanded and contracted. j

Mounted onftheyshaft 15 is` a 'series of spacing sleeves 23 alternatelywith aseries bushing 24.l f r t The|` expanding section25`consists of a sleevedivided longitudinally, into the sec. tions 26 and27, shown Figs. 4 and y6. F igptshows that the inner ends ofthe members 26 and 27, ofithe section 25, are provided with a groove 28 in which to receive r a iiange 29 extending laterallyfrom "the, thrust washer '30. The groove-28 is! wider than the flange 29 of the washer 30, so as to permit somera'dial movement of the sections 26 and 27 at the sametime the flange 29 in associationuwith the grooveQSprevents the sections 26",and 27 from fallinglaway from the shaft`15.` The sectionsl 26 yand 2T are provided with sectional heads 31 andfSQ, and these heads are bored withV tapering openings. ln the head 31 the opening con- 105 verges toward the axisinwardly., of the ser:1 i

15` 'is a nut 43 for the moving the toggle heelA along the 'shaft to 43, isa disk'44 that `nut43 by ay cap screw '45.

'46 and` 'corresponding depressions 47 toggle links 43' and tion, While in the head 32 the opening converges in the same direction, but Y.outwardly of the section.

Mounted on the shaft 15, and between thebushing 24 and the lsleeve 23, is a corresponding tapered ring 33- vin the shape of a truncated cone. A similar'y cone 'ring k34 is mounted at the end of the sleeve v23 under the sections 26 and 27 and these cones are separated by a sleeve 23. A reciprocating toggle head 35 is slidableon the shaft 15 andispositively 'driven'by keys, 36- 37, projectingi'from lopposite sides of the shaft. The head 35 has some rotary lost motion with lvrespect to the shaft, as a'result .of the circumferentially extending vslots `38 and 39 in lwhich the 'keys y36 and 37 move when the shaft may ybe rotated vto a limited extent Without rotatingthehead.

A toggle hee-l 40, in the form of va sleeve, vis slidable Von the ,keys 41 and 42 on the shaft 15 and is positively rotated Withthe shaft,"

but is capable of axial" adjustable movement thereon. VThreaded-on the end of the 'shaft purpose of adjustably adjust lfthe togglemechanism that operates the expansible members 26 and 27. 'Threaded on the shaft 15, and parallel with the nut When the nut 43, 'in' the' disk 44, 'has 'been rotated on the shaft 15 yto asuitable point, `the screiv 45 is turned whereby the 'nut ,isf firmly helden the shaft in adjusted'tposition by the clampin'g'ei'ec-t of the disk 43, or thestress on the threads of the shaft exerted between the nut 43 'y and the disk1'44.

On diametricallyi: opposite sides of the heel and in its transverse face are depressions are made in thefacel of the toggle head 35. These depressions are to receive ends of the 49. The head 32,"of the sections 26'and27, are perforated, as at 50, to receive driving pins 51, that-are yfirmly secured' in the confronting end of the head 35 and which'serve as drivers for the sections 'i 26 and 27. The perforationsv in the head 32 are sufficiently large to permitsme radial Vmovement ofthe sections26 and 27 when ,they are expanded 'into' larger than normal diameter.

`The two-part ring 52 is'provided With i axially?'divided'fsections 53 and 54 vvhich are located -in a groove 55" made-in the shaft 15, andy are held in' 'place' bya one-piece ring 56 ythat isplacedover''the'sections 53 and 54 *and heldin its place by thescrevvs 57. This v ofthe head 35 towards the sections 26 and struct-ureservesasfastopfor the movement 27,irrthek operation of expanding the latter.

also' rserves y'as-a stop to prevent excessive 'movement of the series of tunexpamsible sections 16 to 16:, inclusive, and the distance ive,

may be clamped 'to the 'they strike the boundary shoulders iny the slots 33 and 39. At the same time that the shaft moves ahead, the toggle heel 40 moves with it and the links 48 and 49 of the toggle are moved from their angular position shown in Fig. 9 to approximately the positions shown in Fig. 3, thereby moving the toggle head 35 axially of theshaft, as shown in dotted lines in Fig. 8, causingthe sections 26and 27 to move upon the truncated cones 33 and 34V and separating the sections 26 and 27 to a greater extent from each other increasing the'diameter of the sections or expanding section 25 of the mandrel. The operation will move all of the vsections 16-16f,` inclusalongthe shaft to a limited extent determined by the Washer 21 against the operation ofthe springs 22, so that when the shaft 15 is rotatably moved in'an opposite direction, ythe springs 22 will return the parts to normal positions. In the operation of expanding themandrel 'section 25 the links 48 and 49 are'never moved into parallelism avi'th the truer axial line of the shaft 15 because by the time they arrive `at the position shown in Fig. 3, the end of thehe'ad 35 has contracted the abutment ring sections 53-54, which positively limit the Ymovement of the toggle head.

When it is desirable to-'adjvust the relative positions of the head 35 and the heel'40, the screiv`45 is loosened, which ivill'permit the nut 43 to be readily rotated upon the threaded end of vtheshaft 15, and thereby the heel 49 is moved axially of thefshaft the desired distance, thereupon'the screuTY 45A is tightened and the' heel will be again held in adjusted place.

lnY making spiral pipe the sectionv 2,5 is expanded `forcibly into driving :contact "With the inner surface offthat portion of the pipe which has previously been lformed upon the' section' 16, and it is the `section 25 that is forcibly rotated 'with' the fshaft.

7The other sections 16 -Vmay* be rotated with the shaft'orniay rotate freely thereon, 'there being no positive means by which they'are driven. 1

talities are located.

course .it'will be manifest, towpersons skilled in the art, that as many of the sections 16 may be employed as desired and that when required the section 25 alone may be used in some instances to perform its desirable function.

While I have herein shown a single embodiment of my invention for the purpose of clear disclosure it will be manifest that very many changes may be made in the general arrangement and configuration of the parts within the scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent, is

l. An expansible mandrel comprising a rotatable shaft; a toggle heel rotatable with the shaft; a toggle head, spaced away from the heel, rotatable with the shaft after the toggle has been closed and axially movable thereon during the closing operation; toggle links between the heel and the head arranged to move the latter axially when the shaft is rotated before the head is rotated; two separated mandrel members axially movable by the toggle head and means to increase the diametric distance of separation of said members when so moved.

2. An expansible mandrel comprising an expansible shell; a rotatable shaft therein; a toggle heel adjustably fixed to the shaft; a toggle head, having a lost motion rotary engagement with the shaft; toggle links between the heel and head arranged to move the head axially of theshaft when the latter is rotated and before the shaft engages the head in positive driving relation and means to diametrically expand said shell by the axial movement of said head. f

3. An expansible mandrel comprising a shaft; a series of non-expansible sleeves or sections removably mounted thereon; an ex-` pansible section, on said shaft; a yielding abutment on the said shaft at oneend of said section; a rotatable toggle at the other end, one member thereof rotatable with the shaft, the other member having rotary lost motion connection therewith; toggle links connecting said toggle members, movable by the relatively rotary displacement of said members and means for expanding the expansible 'section by operation of the aforesaid toggle.

In testimony whereof I hereunto subscribed Iny name.

CARL Gi. N AYLOR. 

